165412565 has 4 divisors (see below), whose sum is σ = 198495084. Its totient is φ = 132330048.

The previous prime is 165412553. The next prime is 165412571. The reversal of 165412565 is 565214561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50794129 + 114618436 = 7127^2 + 10706^2 .

It is a cyclic number.

It is not a de Polignac number, because 165412565 - 2⁶ = 165412501 is a prime.

It is a super-2 number, since 2×165412565² = 54722633319758450, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16541252 + ... + 16541261.

It is an arithmetic number, because the mean of its divisors is an integer number (49623771).

Almost surely, 2^165412565 is an apocalyptic number.

It is an amenable number.

165412565 is a deficient number, since it is larger than the sum of its proper divisors (33082519).

165412565 is an equidigital number, since it uses as much as digits as its factorization.

165412565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33082518.

The product of its digits is 36000, while the sum is 35.

The square root of 165412565 is about 12861.2816235397. The cubic root of 165412565 is about 548.9374139977.

The spelling of 165412565 in words is "one hundred sixty-five million, four hundred twelve thousand, five hundred sixty-five".